A scale that cannot say that
Compare a paper scale with 10 mL marks to a made-up claim of an exact 20.123 mL. Explain the problem.
Try it
- Read the complete practice scale: equal marks at 0,10,20,30,40 mL.
- Compare its marker at 20 mL with the invented claim 20.123 mL. Write what the marks can and cannot support.
- Check the product and say why you kept or changed one part. Tell or show it in your usual way: words, drawing, pointing, signing, typing, dictation or your communication device. Work quietly or privately, pause, ask for a helper, or return later. Sharing and recording are optional.
Grown-up help
Look for: The scale does not support that extra precision; suggest an appropriate reading/estimate for the familiar instrument procedure.
Next help: If extra decimal places are accepted, point to the actual 10 mL gaps and ask which marks would support them. Keep 20 mL as the supplied marker reading.
Full lesson · Source facts/limits · F1
Modified from Year 4 Science alignment, standard elaborations and Years 3–4 techniques and conditions, © State of Queensland (QCAA) 2023, covered CC BY 4.0 with exceptions. Our task criteria are original; these are not official A–E bands. Actual folio and on-balance professional judgment remain necessary.